<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-alert title="添加商品信息"
                type="info"
                center
                show-icon
                :closable="false">
      </el-alert>

      <el-steps :space="200"
                :active="activeIndex - 0"
                finish-status="success"
                align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-position="top">
        <el-tabs tab-position="left"
                 v-model="activeIndex"
                 :before-leave="beforeLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息"
                       name="0">
            <el-form-item label="商品名称"
                          prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格"
                          prop="goods_price"
                          type="number">
              <el-input v-model="addForm.goods_price"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量"
                          prop="goods_weight">
              <el-input v-model="addForm.goods_weight"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量"
                          prop="goods_number">
              <el-input v-model="addForm.goods_number"
                        type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类"
                          prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat"
                           :options="cateList"
                           :props="cateProps"
                           @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数"
                       name="1">
            <el-form-item :label="item.attr_name"
                          v-for="item in manyTableData"
                          :key="item.attr_id">
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb"
                             v-for="(cb, i) in item.attr_vals"
                             :key="i"
                             border>
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性"
                       name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片"
                       name="3">
            <el-upload :action="uploadUrl"
                       :on-preview="handlePreview"
                       :on-remove="handleRemove"
                       :on-success="handleSuccess"
                       list-type="picture"
                       :headers="headersObj">
              <el-button size="small"
                         type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容"
                       name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary"
                       class="addBtn"
                       @click="addGoods">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览"
               :visible.sync="imgVisible"
               width="50%"
               height="50%">
      <img :src="previewPath"
           alt=""
           class="previewImg">
    </el-dialog>

  </div>
</template>

<script>
import { getCateData } from '../../network/goods'
import { getCateList } from '../../network/cateParams'
import { addGoods } from '../../network/goodsList'
export default {
  name: 'Add',
  data () {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        //商品的参数（数组），包含 `动态参数` 和 `静态属性`
        attrs: []
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ],
      },
      cateList: [],
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      //商品参数列表数据
      manyTableData: [],
      //商品属性列表数据
      onlyTableData: [],
      uploadUrl: 'https://lianghj.top:8888/api/private/v1/upload',
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      imgVisible: false,
      //预览的图片地址
      previewPath: '',
    }
  },
  created () {
    this.getCateList();
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }
      return null;
    }
  },
  methods: {
    async getCateList () {
      const res = await getCateData();
      if (res.meta.status !== 200) {
        this.$message.error('获取商品分类数据失败');
      }
      this.cateList = res.data;;
    },

    //级联选择器选项发生变化
    handleChange () {
      //console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        return this.addForm.goods_cat = [];
      }
    },

    // 切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换。
    beforeLeave (activeName, oldActiveName) {
      if (oldActiveName === '0') {
        if (this.addForm.goods_name.length === 0) {
          this.$message.error('请填写商品名称');
          return false;
        } else if (this.addForm.goods_price <= 0) {
          this.$message.error('商品价格要大于0');
          return false;
        } else if (this.addForm.goods_weight <= 0) {
          this.$message.error('商品重量要大于0');
          return false;
        } else if (this.addForm.goods_number <= 0) {
          this.$message.error('商品数量要大于0');
          return false;
        } else if (this.addForm.goods_cat.length !== 3) {
          this.$message.error('请选择商品分类');
          return false;
        }
      }
    },

    //tab 被选中时触发
    async tabClicked () {
      //console.log(this.activeIndex);
      if (this.activeIndex === '1') {
        const res = await getCateList(this.cateId, 'many');
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品参数失败');
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ');
        });
        this.manyTableData = res.data;
        //console.log(this.manyTableData);
      } else if (this.activeIndex === '2') {
        const res = await getCateList(this.cateId, 'only');
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品属性失败');
        }
        this.onlyTableData = res.data;
        //console.log(this.onlyTableData);
      }
    },

    //处理预览图片
    handlePreview (file) {
      //console.log(file);
      this.previewPath = file.response.data.url;
      this.imgVisible = true;
    },

    //处理删除图片
    handleRemove (file) {
      //console.log(file);
      let filePath = file.response.data.tmp_path;
      let i = this.addForm.pics.findIndex(item => {
        item.pic === filePath;
      })
      this.addForm.pics.splice(i, 1);
      //console.log(this.addForm);
    },

    //图片上传成功
    handleSuccess (response) {
      //console.log(response);
      let picObj = {
        pic: response.data.tmp_path
      }
      this.addForm.pics.push(picObj);
      //console.log(this.addForm);
    },

    async addGoods () {
      const form = JSON.parse(JSON.stringify(this.addForm));
      form.goods_cat = this.addForm.goods_cat.join(',');
      this.manyTableData.forEach(item => {
        const attrObj = {
          attr_id: item.attr_id,
          attr_value: item.attr_vals
        }
        form.attrs.push(attrObj)
      });
      //console.log(form);

      const res = await addGoods(form);
      if (res.meta.status !== 201) {
        return this.$message.error('添加商品失败');
      }
      this.$message.success('添加商品成功');
      this.$router.push('/goods');
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0;
}

.previewImg {
  width: 100%;
  height: 60vh;
}

.addBtn {
  margin-top: 15px;
}
</style>